Annual report pursuant to Section 13 and 15(d)

Borrowings - Terms of MetLife Facility (Detail)

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Borrowings - Terms of MetLife Facility (Detail) - MetLife Credit Facility
12 Months Ended
Dec. 31, 2019
USD ($)
Debt Instrument [Line Items]  
Aggregate Commitment $ 200,000,000
Principal Outstanding 164,008,000
Long-term debt, additional amount available $ 22,900,000
Minimum annualized rate (as percent) 2.50%
Minimum  
Debt Instrument [Line Items]  
Commitment fee (as percent) 0.10%
Unused fee (as percent) 0.10%
Maximum  
Debt Instrument [Line Items]  
Commitment fee (as percent) 0.20%
Unused fee (as percent) 0.20%
Notes payable to bank  
Debt Instrument [Line Items]  
Aggregate Commitment $ 200,000,000
Weighted-average interest rate (as percent) 3.42%
Principal Outstanding $ 163,908,000
Undrawn Commitment 21,530,000
Notes payable to bank | Lease One  
Debt Instrument [Line Items]  
Aggregate Commitment $ 16,500,000
Term of debt 28 years 6 months 26 days
Weighted-average interest rate (as percent) 3.70%
Notes payable to bank | Lease Two  
Debt Instrument [Line Items]  
Aggregate Commitment $ 25,500,000
Term of debt 28 years 6 months 26 days
Weighted-average interest rate (as percent) 3.81%
Line of credit  
Debt Instrument [Line Items]  
Aggregate Commitment $ 75,000,000
Principal Outstanding 100,000
Undrawn Commitment $ 74,900,000
Line of credit | LIBOR  
Debt Instrument [Line Items]  
Basis spread (as percent) 2.00%